`METIS_PartGraph*` compatibility for v5 interface
In METIS, the ubvec
parameter (array of size ncon
that specifies the allowed load imbalance tolerance for each constraint) is optional but SCOTCH_METIS_PartGraph
requires it to be non-NULL
. For the METIS v3 interface, this parameter is just set to kbalval = 0.01
always. Should the same be done for v5 so that user codes which want to use the default do not experience an error?